Accumulation of 2,3,7,8-tetrachlorodibenzo-p-dioxin by rainbow trout (Onchorhynchus mykiss) at environmentally relevant dietary concentrations
Paul D. Jones, Kurunthachalam Kannan, John L. Newsted, Donald E. Tillitt, Lisa L. Williams, John P. Giesy
2001, Environmental Toxicology and Chemistry (20) 344-350
Rainbow trout were fed a diet containing 1.8, 18, or 90 pg/g 3H-2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) for up to 320 d. Concentrations of TCDD were determined in muscle, liver, and ovaries at 100, 150, 200, and 250 d. Concentrations of TCDD reached an apparent steady-state concentration in liver after 100 d of...
The national stream quality accounting network: A flux-basedapproach to monitoring the water quality of large rivers
R. P. Hooper, Brent T. Aulenbach, V.J. Kelly
2001, Hydrological Processes (15) 1089-1106
Estimating the annual mass flux at a network of fixed stations is one approach to characterizing water quality of large rivers. The interpretive context provided by annual flux includes identifying source and sink areas for constituents and estimating the loadings to receiving waters, such as reservoirs or the ocean. Since...
Pathogenicity, serological responses, and diagnosis of experimental and natural malarial infections in native Hawaiian thrushes
Carter T. Atkinson, Julie K. Lease, B. M. Drake, N. P. Shema
2001, Condor (103) 209-218
Omao (Myadestes obscurus) from the Hawaiian Islands typically have very low prevalences of infection with avian malaria (Plasmodium relictum) and it is not clear whether they share the same high susceptibility to this parasite that has been documented in native Hawaiian honeycreepers. We exposed four captive Omao to single infective...
Ancient drainage basin of the Tharsis region, Mars: Potential source for outflow channel systems and putative oceans or paleolakes
J. M. Dohm, J.C. Ferris, V.R. Baker, R. C. Anderson, T.M. Hare, R.G. Strom, N.G. Barlow, K. L. Tanaka, J.E. Klemaszewski, D. H. Scott
2001, Journal of Geophysical Research E: Planets (106) 32943-32958
Paleotopographic reconstructions based on a synthesis of published geologic information and high-resolution topography, including topographic profiles, reveal the potential existence of an enormous drainage basin/aquifer system in the eastern part of the Tharsis region during the Noachian Period. Large topographic highs formed the margin of the gigantic drainage basin. Subsequently,...
Effect of land cover, habitat fragmentation and ant colonies on the distribution and abundance of shrews in southern California
Juha Laakkonen, Robert N. Fisher, Ted J. Case
2001, Journal of Animal Ecology (70) 776-788
Because effects of habitat fragmentation and anthropogenic disturbance on native animals have been relatively little studied in arid areas and in insectivores, we investigated the roles of different land covers, habitat fragmentation and ant colonies on the distribution and abundance of shrews, Notiosorex crawfordi and Sorex ornatus, in southern California.Notiosorex...
Utility of stable isotope analysis in studying foraging ecology of herbivores: Examples from moose and caribou
Merav Ben-David, Einav Shochat, Layne G. Adams
2001, Alces (37) 421-434
Recently, researchers emphasized that patterns of stable isotope ratios observed at the individual level are a result of an interaction between ecological, physiological, and biochemical processes. Isotopic models for herbivores provide additional complications because those mammals consume foods that have high variability in nitrogen concentrations. In addition, distribution of amino...
Cost considerations for long-term ecological monitoring
L. Caughlan, K.L. Oakley
2001, Ecological Indicators (14) 1-12
For an ecological monitoring program to be successful over the long-term, the perceived benefits of the information must justify the cost. Financial limitations will always restrict the scope of a monitoring program, hence the program's focus must be carefully prioritized. Clearly identifying the costs and benefits of a program will...
Mourning dove productivity in California during 1992-95: Was it sufficient to balance mortality?
M. R. Miller, C.L. Stemler, S.D. Blankenship
2001, Journal of Wildlife Management (65) 300-311
Mourning dove (Zenaida macroura) populations have declined steadily in the western United States since 1966. We investigated the role of recruitment in this long-term problem by studying nesting ecology of mourning doves from March to September 1992-95, in the northern Central Valley, California, USA. We studied nesting doves in blue...
Metabolic enzyme activity during smolting stream- and hatchery-reared Atlantic salmon (Salmo salar)
J. B. K. Leonard, S. D. McCormick
2001, Canadian Journal of Fisheries and Aquatic Sciences (58) 1585-1593
Polar bears in the Beaufort Sea: A 30-year mark-recapture case history
Steven C. Amstrup, T. L. McDonald, I. Stirling
2001, Journal of Agricultural, Biological, and Environmental Statistics (6) 221-234
Knowledge of population size and trend is necessary to manage anthropogenic risks to polar bears (Ursus maritimus). Despite capturing over 1,025 females between 1967 and 1998, previously calculated estimates of the size of the southern Beaufort Sea (SBS) population have been unreliable. We improved estimates of numbers of...
Birds at a Southern California beach: seasonality, habitat use and disturbance by human activity
Kevin D. Lafferty
2001, Biodiversity and Conservation (10) 1949-1962
Use of a Santa Barbara beach by people and birds varied in both time and space. There were 100 birds, 18 people and 2 dogs per kilometer. Bird density varied primarily with the season and tide while human activity varied most between weekend and weekday. Bird distributions along the beach...
Nitrogen input to the Gulf of Mexico
D. A. Goolsby, W.A. Battaglin, Brent T. Aulenbach, R. P. Hooper
2001, Conference Paper
Historical streamflow and concentration data were used in regression models to estimate the annual flux of nitrogen (N) to the Gulf of Mexico and to determine where the nitrogen originates within the Mississippi Basin. Results show that for 1980-1996 the mean annual total N flux to the Gulf of Mexico...
Persistence of oiling in mussel beds after the Exxon Valdez oil spill
M.G. Carls, M.M. Babcock, P.M. Harris, G.V. Irvine, J.A. Cusick, S.D. Rice
2001, Marine Environmental Research (51) 167-190
Persistence and weathering of Exxon Valdez oil in intertidal mussel (Mytilus trossulus) beds in Prince William Sound (PWS) and along the Gulf of Alaska was monitored from 1992 to 1995. Beds with significant contamination included most previously oiled areas in PWS, particularly within the Knight Island group and the Kenai Peninsula. In...
Disturbance to wintering western snowy plovers
Kevin D. Lafferty
2001, Biological Conservation (101) 315-325
In order to better understand the nature of disturbances to wintering snowy plovers, I observed snowy plovers and activities that might disturb them at a beach near Devereux Slough in Santa Barbara, California, USA. Disturbance (activity that caused plovers to move or fly) to wintering populations of threatened western snowy...
Juvenile groundfish habitat in Kachemak Bay, Alaska, during late summer
Alisa A. Abookire, John F. Piatt, Brenda L. Norcross
2001, Alaska Fishery Research Bulletin (8) 45-56
We investigated the habitat of juvenile groundfishes in relation to depth, water temperature, and salinity in Kachemak Bay, Alaska. Stations ranging in depth from 10 to 70 m and with sand or mud-sand substrates were sampled with a small-meshed beam trawl in August-September of 1994 to 1999. A total of...
Antibody-producing cells correlated to body weight in juvenile chinook salmon (Oncorhynchus tshawytscha) acclimated to optimal and elevated temperatures
L.N.M. Harrahy, C.B. Schreck, A.G. Maule
2001, Fish and Shellfish Immunology (11) 653-659
The immune response of juvenile chinook salmon (Oncorhynchus tshawytscha) ranging in weight from approximately 10 to 55 g was compared when the fish were acclimated to either 13 or 21?? C. A haemolytic plaque assay was conducted to determine differences in the number of antibody-producing cells (APC) among fish of...
Effects of a test flood on fishes of the Colorado River in Grand Canyon, Arizona
R.A. Valdez, T.L. Hoffnagle, C.C. McIvor, T. McKinney, W.C. Leibfried
2001, Ecological Applications (11) 686-700
A beach/habitat-building flow (i.e., test flood) of 1274 m3/s, released from Glen Canyon Dam down the Colorado River through Grand Canyon, had little effect on distribution, abundance, or movement of native fishes, and only short-term effects on densities of some nonnative species. Shoreline and backwater catch rates of native fishes,...
Nature and transformation of dissolved organic matter in treatment wetlands
L. B. Barber, J.A. Leenheer, T.I. Noyes, E.A. Stiles
2001, Environmental Science & Technology (35) 4805-4816
This investigation into the occurrence, character, and transformation of dissolved organic matter (DOM) in treatment wetlands in the western United States shows that (i) the nature of DOM in the source water has a major influence on transformations that occur during treatment, (ii) the climate factors have a secondary effect...
Local site effects and dynamic soil behavior
E. Afak
2001, Soil Dynamics and Earthquake Engineering (21) 453-458
Amplitudes of seismic waves increase significantly as they pass through soft soil layers near the earth's surface. This phenomenon, commonly known as site amplification, is a major factor influencing the extent of damage on structures. It is crucial that site amplification is accounted for when designing structures on soft soils....
Gill Na+-K+-2Cl- cotransporter abundance and location in Atlantic salmon: Effects of seawater and smolting
Ryan M. Pelis, Joseph D. Zydlewski, Stephen D. McCormick
2001, American Journal of Physiology - Regulatory, Integrative and Comparative Physiology (280) R1844-R1852
Na+-K+-2Cl−cotransporter abundance and location was examined in the gills of Atlantic salmon (Salmo salar) during seawater acclimation and smolting. Western blots revealed three bands centered at 285, 160, and 120 kDa. The Na+-K+-2Cl−cotransporter was colocalized with Na+-K+-ATPase to chloride cells on both the primary filament and secondary lamellae. Parr acclimated...
Development of mineral site counts to reliably index the Pacific Coast breeding population of band-tailed pigeons
Michael L. Casazza, J.L. Yee, C.T. Overton, D.L. Orthmeyer, D.R. Yparraguirre
2001, Report
No abstract available at this time...
Herpetofaunal Monitoring in MSCP Region of San Diego
C. Rochester, S. Hathaway, C. Brown, K. Pease, Robert N. Fisher
2001, Report
No abstract available at this time...
Fire-induced Tree Mortality in the Mixed Conifer Forests of the Sierra Nevada, California
P. van Mantgem
2001, Thesis
No abstract available at this time...
Archaic agencies, muddled missions, and conservation in the 21st century
Fred B. Samson, Fritz L. Knopf
2001, BioScience (51) 869-873
No abstract available....
Experimental assessment of the toxicity of the mosquito larvicide Golden Bear Oil (GB-1111): (1) Field evaluations on duckling, target, and non-target prey survival; (2) Laboratory evaluations on reared mallard and bobwhite eggs, and wild redwing blackbird eggs
A.K. Miles, S.P. Lawler, D. J. Hoffman, P.A. Albers, M. J. Melancon, D. Dritz, S. Spring, D.M. Buscemi
2001, Report
No abstract available at this time...
